Loop-sewing attachment for sewing-machines.



w. WILSON. LOOP SEWING ATTACHMENT FOR SEWING MACHINES.

APPLICATION FILED APR. \6. I915- Patented Sept. 25, 1917.

. the loop WILLIAM WiLSON, 0F BOSTON,

MASSACHUSETTS ASSIGNOR TO CAMPBELL BOSWORTH MACHINERY COMPANY, OF PORTLAND, MAINE, A CORPORATION OF MAINE.

LOOP-SEWING ATTACHMENT FOR SEWIN(3r-MACHINE-S.

Application filed April 16, 1915; Serial No. 21,775.

To all whom it may concern:

Be it known that I, WILLIAM VVILsoN, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Loop-Sewing Attachments for Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make and use the same.

The present. invention relates to an improvement in loop-sewing attachments for sewing machines. The object of the invention is to reorganize and simplify the construction of loop-sewing attachments whereby the operation of sewing harness or other loops may be more expeditiously performed. To this end the invention consists in the loopholder hereinafter described and particularly pointed out in the claims.

In the accompanying drawings illustrating the preferred form of the invention, Figure 1 is a side elevation of a part of a sewing machine showing the application of the improved loop-holder thereto; Fig. 2 is a partial sectional elevation ofthe parts shown in Fig. 1; Fig.3 is a plan of the improved loop-holder shown in Fig. 1; Figs. 4 and 5 are sectional'views of a modified form of loop-holder; and Figs. 6 and 7 are perspective views of harness loops formed on the improved loop-holder.

The sewing machine of the illustrated embodiment of the invention may be of any usual or preferred form, that shown being the well known Campbell wax thread machine, the parts of the sewing machine nec essary to disclose the application of the improved loop-holder thereto comprising a shuttle-race 10, a presser foot 11 and a needle- 13. The improved loop-holder, which is indicated generally by the reference character 15, performs-the function of'pre'senting the harness loop 'to be sewn, at the correct angle to the needle so that as the needle rises during the operation of sewing a seam it may clear the underside of the loop and penetrate the margin ofthe upper side of so as to form a seam therein parallel to the edge of .the loop. The loopholder 15 comprises a work table or body portion 16 and a support therefor consisting of an upright 18 and a base 19. Upon the Specification of Letters Patent.

.The upright 18 is Patented Sept. 25, 1917.

the work or loop 17 upon which the seam sewing operation is to be performed. The body or work table 16 in the form of the invention shown in Figs. 1, 2 and 3 is made integral with the upright 18 and projects perpendicularly therefrom. integral with the base 19, the angular relation between the upright 18 and the base 19 being the angle of presentation of the work to the needle during the formation of the seam. The loop-holder is mounted upon the shuttle-race 10, the base 19 of the holder being provided with a groove 20 in which is received a spline 21 projecting upwardly from the shuttle-race 10, the arrangement being such that the loopholder is held against lateral movement. Provision for longitudinal adjustment of the loop-holder .issecured by means of a slide 23 movable longitudinally in the shuttle-race 10 and a screw 24 having a flange 25, the rim of which is received in a slot in the slide 23. The loop-holder is secured in adjusted position by means of the screw 26 which clamps the slide 23 and the base 19 of the loops holder rigidly to the shuttle-race 10.-

The width of the margin formed between the seam and the edge of the loop maybe regulated by means of an edge gage 28 which consists of a gage'plate 29 and a top plate 30 arranged at right angles to each other. The gage plate 29 is provided with a hole of such size and formation that it .fits loosely around the body of the work table 16. The edge'gage 28 is secured to the upright 18 by means of screws 32v which pass through the elongated holes 33 formed in the top plate and are received in threaded holes in the upright. The elongated holes 33 provide for the lateral adjustmentofthe edge gage, the screws 32 securing the edge gage in-adjusted position. The upper portion of the body or work table 16 is made flat so that the loop may restthereon in the correct position for the sewing operation a slot .35 passing angularly through the work table being provided for the needle. The above-described construction and arrangement of parts is such that when-the strip of leather, with its properly scarfed ends, of which the loop is to be formed, rests upon the work table, the needle, as it rises during the sewing operation, clears the lower side of the loop and passes through the margin of the upper side of the loop so as to form work table rests a seam therein arranged angularly to the face of the loop and parallelly to the edge thereof. When the seam on one margin of the loop is formed, the loop is removed from the work table and the other margin presented to the needle. If it is necessary at any time to remove the loop-holder from the machine, this may be done by simply taking out the screw 26 and lifting off the loopholder, which may again be restored to its operative position, without adjustment of parts, by simply replacingthe loop-holder and securing it to the shuttle race by the screw 26. It is obvious, therefore, that the improved loop-holder is one of greatsimplicity of construction and of certainty of screw a3. In other operation; the edge gage 28 affording means whereby the width of the margin formed between the seam and the edge may be regu- In' the modified form. of the invention shown in Figs. a and 5 the body or work table 40 is provided with a shank H which is received in a hole in the upright L2 and is secured therein by means 7 of the setrespects the work table 40 is substantially the same as the form shown in Figs. 1, 2 and 33. The construction of the modified form of loop-holder is such that it may be easily removed and work tables of different size and form inserted. It will be readily perceived that both forms maybe used for sewing loops of various sizes andshapes such'as are shown in Figs. 6 and 7. I Y

The present invention contemplates a loopsewing attachment for sewing machines of such form and construction that the work resting thereon is always presented at the correct angle for the seam sewing operation, the necessity for either angular or lateral adustment being eliminated; means being also provided for regulating the width of the margin formed by the seam. The invention may, therefore, be embodied in other forms than that shown in the illustration thereof.

Having thus described my invention, what I claim is: V

lIAloop-sewing attachment for sewing machines having, in combination, a shuttle race, and a loop-holder mounted thereon comprising a work table tipped obliquely with relation to the path of the needle so that the part of the loop resting on the work table may be'pierced by the needle while the under part of the loop is cleared thereby, means secured to the shuttle-race for sup porting the work table in its obliqueposition, and means surrounding the work table and against which one end of the loop is Copies of this patent may be obtained for machines having," '11 combination,

five cents each, by addressing the Washington, D. 0.

adapted to abut, for preventing the under part of the loop from interfering with the needle and for determiningth'e widthnf the margin formed between the seam and the edge of the loop.

'2. A loop-sewing attachment for sewing a shuttlerace and a loop-holder mounted thereon, comprising a base, anupright, a work table for presenting loops to the needle, and an edge gage movable longitudinally of the work table for regulating the width of the margin formed between the seam and the edge of the loop.

3. A loop-sewing attachment for sewing machines having, in combination, a shuttlerace, and a loop-holder mounted thereon comprising a work table tipped obliquely with relation to the path of'the needle so that the part of the loop resting on the work table may be pierced by the needle while the under part of the loop is cleared thereby, an upright to which the work table is secured, and la base adapted to be fastened to the shuttle-race, for supporting the upright, said upright and said base having an angular relation equal to the angle between the work table and the patho'f the needle.

' 4:. A loop-sewing attachment for. sewing machines having, in combination, a shuttle? race and a loop-holder mounted on the shuttle-race, having provision for longitudinal adjustment thereon. y y 5. A loop-sewing attachment for sewing machines having, in combination, a work table, a support therefor for presenting the loop at the proper angle to the needle and an. edge gage having provision for move ment longitudinally of the work table for regulating the width of themargintormed between'the seam and the edge of the loop, 6. A loop-sewing attachment forv sewing machines having, in combination, a shuttlerace, a work table, a support for the work table mounted on the shuttle-race, the work tableand support being constructed and arranged for presenting the'loop at the proper angle to the needle,'and an edge gage for regulating the width of the margin formed between the seam and the edge of'the loop consisting of a gage plate and a top plate arranged at right angles to each other, the

gage plate having provision for engaging the top and bottomsidesof the loop and the top plate having provision for lateral movementrelatively to the work table support thereby permittingthe gage plate to move longitudinally of the work table.

A WILLIAM 'wILsoN,

Commissioner of Patents, 

